Contents

HAZARD DEFINITIONS

. 2

5. ELECTRICAL CONNECTIONS

 

PLEASE READ BEFORE PROCEEDING

. 3-4

Boiler Operating Temperature Control

33

RATINGS

. 5

Room Thermostat or Remote Thermostat Connection . . 33

THE SOLUTION --HOW IT WORKS

. 6-8

Power Venter Connection to Terminal Strip

33

1. DETERMINE BOILER LOCATION

 

Pump Wiring for a Heating Boiler

34

Location of Unit

. 9

Temperature Adjustment

34

Clearances

. 9

Temperature Control Settings

34

Combustion and Ventilation Air

10-12

Maximum Set Point Determination

35

2. VENTING

 

Outdoor Air Reset Option

37

A Conventional Negative Draft Venting System

13-14

Additional Temperature Controls

37-38

Vertical Vent Termination Clearances

15

Blocked Vent and Flame Roll-Out / Flame Interlock Switch . 38

Masonry Chimney Installation

16

6. STARTUP

 

Inspection of a Masonry Chimney

16

Initial Startup

39

Automatic Vent Damper

17

Lighting Instructions for Spark Ignition Pilot Models (M9) . . . .

39

3. GAS CONNECTIONS

 

Safety Shutoff Test for Spark Ignition Pilot System

40

Gas Supply

18

Intermittent Pilot Spark Ignition System (M9)

41

Gas Pressure Test

18

Freeze Protection

41

Gas Connection

18

Water Treatment

41

Gas Piping

19

7. MAINTENANCE

 

Gas Manifold Pressure Adjustment Procedure

20

Maintenance and Annual Startup

42-48

Checking Gas Supply Pressure

21

8. TROUBLESHOOTING

49

Combination Gas Valves

22

9. DIAGRAMS

50

4. WATER CONNECTIONS

 

 

 

Relief Valve

23

 

 

Water Flow Switch (if equipped)

23

 

 

Low Water Cutoff (if equipped)

24

 

 

Typical Heating Boiler Installations

24

 

 

Piping of the Boiler System

25

 

 

Performance Loop

27

 

 

Primary/Secondary Boiler Piping

27-28

 

 

Low Temperature Bypass Requirements

28

 

 

Boiler Flow Rates

28

 

 

Primary / Secondary Piping

29-31

 

 

Full System Flow

32-33

 

 

Hazard definitions

The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product.

DANGER

WARNING

CAUTION

CAUTION

NOTICE

DANGER indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury.

WARNING indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury.

CAUTION indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

CAUTION used without the safety alert symbol indicates a potentially hazardous situation which, if not avoided, may result in property damage.

NOTICE indicates special instructions on installation, operation, or maintenance that are important but not related to personal injury or property damage.

2

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Lochinvar 45,000 - 260,000 BTU/HR service manual Contents

45,000 - 260,000 BTU/HR specifications

Lochinvar, a leader in high-efficiency heating solutions, presents the Lochinvar line of boilers, specifically the Lochinvar 45,000 - 260,000 BTU/HR models. These boilers are designed to meet a wide range of heating demands, making them ideal for residential and commercial applications alike.

One of the key features of the Lochinvar boilers is their impressive efficiency rating. Utilizing advanced condensing technology, these units can achieve efficiencies of up to 96% AFUE (Annual Fuel Utilization Efficiency). This high efficiency not only reduces fuel consumption but also lowers utility bills, making it a cost-effective solution for heating needs.

The Lochinvar boilers are equipped with a powerful heat exchanger constructed from durable stainless steel. This design not only maximizes heat transfer but also enhances the longevity of the unit. By preventing corrosion and minimizing maintenance requirements, the stainless steel heat exchanger ensures that the boiler operates at peak performance for years.

Another significant aspect of the Lochinvar boilers is their modulating burner system. This technology allows the boiler to adjust its output based on demand, ensuring that it only uses the energy necessary to maintain the desired temperature. This feature not only improves efficiency but also contributes to a more comfortable indoor environment by minimizing temperature fluctuations.

The Lochinvar series also showcases a user-friendly control interface. The advanced LCD display allows for easy monitoring and adjustment of system settings. Connectivity options are often included, providing the ability to integrate with modern building management systems for enhanced control and diagnostics.

Safety features abound in the Lochinvar models, which include built-in safeguards such as temperature and pressure relief valves, flame detection systems, and modulation cut-off to protect against overheating and other hazardous conditions.

Moreover, these boilers are designed for easy installation and maintenance. Compact dimensions and lightweight design facilitate straightforward setup, even in tight spaces. Additionally, users can take advantage of the unit’s self-diagnostic capabilities to simplify troubleshooting and reduce downtime.

In conclusion, the Lochinvar 45,000 - 260,000 BTU/HR boilers represent a pinnacle of innovation in heating technology. With high efficiency, advanced control systems, durable components, and safety features, they stand out as reliable and effective solutions for a variety of heating applications, ensuring comfort and efficiency in any environment.